package homework_03;

public class home_09 {
    public static void main(String[] args) {
        int a=90,n;
        if (a>=90&&a<=100){
            System.out.println("A");
        }else if(a>=80&&a<90){
            System.out.println("B");
        }else if(a>=70&&a<80){
            System.out.println("C");
        }else if(a>=60&&a<70){
            System.out.println("D");
        }else if(a<60){
            System.out.println("E");
        }else{
            System.out.println("分数无效");
        }
    }
}
